Yolk

Yolk

2.(Zol.) An oily secretion which naturally covers the wool of sheep.
[1913 Webster]

Yolk cord(Zol.), a slender cord or duct which connects the yolk glands with the egg chambers in certain insects, as in the aphids. --
Yolk gland(Zol.), a special organ which secretes the yolk of the eggs in many turbellarians, and in some other invertebrates. See Illust. of Hermaphrodite in Appendix. --
Yolk sack(Anat.), the umbilical vesicle. See under Unbilical.
[1913 Webster]

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